Shower room floor buildup

[jfb]

I am getting ready to do the floor for a small outbuilding/office with a small toilet/shower room.

It is an old barn with solid walls and the floor build up so far is an insulated limecrete slab (expanded glass sub base and 100mm limecrete).

 

For the shower room I was thinking of laying some 50mm battens down and infilling with some 50mm EPS i have spare. Then gluing and screwing 18mm ply to the battens, then PVA the ply and finally ceramic or cork tiles on top. One sheet of ply will be big enough for the whole room.

 

Does this sound sensible? Could I get away with not fixing the battens to the limecrete floor?

Edited February 12, 2020 by jfb

[Big Jimbo]

I did a similar thing on a workshop. just laid the battens down on the concrete, (which did include a dpm) and used 18mm t n g on top screwed to the battens. Nice warm floor, and my fee were never cold.